Final version of my mob head farm. This design detects thunder storms and automatically charges creepers using the 1.17 lightning rod.
This is designed to be attached to a larger mob farm. When whether is clear, the creeper-charger is inactive, allowing creepers to be killed for drops. Once a storm is detected, creepers are diverted to the creeper-charger (lightning rods).
Credit
This design uses a modified mob sorter designed by ilmango